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TT: Tiefe Temperaturen

TT 6: Postersitzung I: Mesoskopie(1-21), amorphe Metalle und Defektsysteme(22-29), Kryotechnik, Kernmagnetismus(30-37), festes N₂(38), Quantenflüssigkeiten und -kristalle(39-48), dünne supraleitende Filme(49-68), schwere Fermionen und Kondosysteme(69-92), Fullerene(93-94)

TT 6.101: Poster

Dienstag, 18. März 1997, 09:30–13:00, Z1

Electronic Structure of SrNbO_3.45 Single Crystals Measured by Various Photoemission Techniques — •C.S. Gopinath¹, D.H. Lu¹, M. Schmidt¹, T.R. Cummins¹, N. N"ucker¹, S. Schuppler¹, and F. Lichtenberg² — ¹Forschungszentrum Karlsruhe, Institut f. Nukleare Festkörperphysik, Postfach 3640, D-76021 Karlsruhe — ²Varta Batterie AG, R and D Center, D-65779 Kelkheim

The electronic structure of the semiconducting and layered-perovskite related compound SrNbO_3.45 has been investigated by ultraviolet photoemission spectroscopy, both angle-integrated (UPS) and angle resolved (ARUPS). From constant initial state spectroscopy, the low intensity feature observed in UPS at 0.6 eV below the Fermi level, E_F, is attributed to Nb 4d states. UPS measurements indicate that the main valence band consists essentially of oxygen 2p states. ARUPS studies show two bands near the E_F with very different dispersions: Along Γ-X, one band exhibits no discernible dispersion, whereas the other disperses strongly and even crosses E_F. No dispersion appears along the Γ-Y direction. The induction of metallic and possible superconducting behaviour in this layered niobate system is also discussed.